Security Flaw Turns Gmail into Open-Relay Server

A recently-discovered flaw in Gmail is capable of turning Google’s e-mail service into a highly effective spam machine. According to the Information Security Research Team, Gmail is susceptible to a man-in-the-middle attack that allows a spammer to send thousands of bulk e-mails through Google’s SMTP service without fear of detection. This attack bypasses both Google’s identity fraud protection mechanisms and the current 500-address limit on bulk e-mail